Link to this headingAntennas

How EM fields work with Antennas
Good Antenna Designs
Definitions
How antennas work with some basic math

N1201SA VNA: used to measure how good an antenna is

Link to this headingDefinitions

decibels (dB): Is the ratio of one signal to another.

  • -10 dB is 1/10th the signal. While -20dB is 1/100th the signal
    dBm: It the absolute value of a signal. 0 dBm is 1mW, 3 dBm is 2mW, -3 dBm is 0.5mW
    Power Loss(dB): The Amount of decibels that is lost in the transmission of the data
    • This is done by a subtraction because Decibels are logs
      Antenna Gain (DBi): This is the measurement of the maximum antenna gain when it is directed correctly instead of using an isotropic antenna
    • The higher this number the more directional the antenna is.
      dBd: dBd refers to the antenna gain with respect to a reference dipole antenna

Link to this headingBeamforming/MIMO

Using multiple Antennas at known locations you can phaseshift the message and create interference waves making areas of higher Signal to noise ratio. (This also makes pockets of lower Signal-to-Noise ratio)

This also works in reverse with the single transmit antenna and two receiving antennas. If you know the phase difference between the two receiving antennas you can shift it back and combine the wave forms together.

Source

Link to this headingOmni-Directional

  • Good Circular Horizontal Polarization

Link to this headingYagi Antenna

  • Good Vertical and Horizontal in a particular Location

Link to this headingMoxon antenna

433MHz 3D Printed Antenna
433MHz 3D Printed Frame

Link to this headingLog Periodic Antenna

Link to this headingVivaldi Antenna

  • Highly Directional antenna
  • Range from 1-21 GHz

Link to this headingHelical Antenna

  • Highly Directional

Link to this headingDi-Pole Antennas

  • Only work well on their residence Frequency
  • Their length correlates to the frequency
    • Larger antenna lower the frequency

Link to this headingTurnstile Antenna

Link to this headingQuadrifilar Helix (QFH) Antenna

Link to this headingV-Dipole Antenna

Link to this headingDouble Cross Antenna (DCA)

Ally Express Antennas:

GPS antenna

Link to this headingmaking Your own

https://github.com/schneider42/active-iridium-antenna